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bgneal@472
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1 """
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2 This module contains decorators for the antispam application.
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3
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4 """
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5 from datetime import timedelta
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6 from functools import wraps
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7
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8 from django.shortcuts import render
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bgneal@505
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9 from django.utils import simplejson
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10
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11 from antispam.rate_limit import RateLimiter, RateLimiterUnavailable
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12
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13
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14 def rate_limit(count=10, interval=timedelta(minutes=1),
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15 lockout=timedelta(hours=8)):
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16
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17 def decorator(fn):
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18
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19 @wraps(fn)
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20 def wrapped(request, *args, **kwargs):
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21
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22 ip = request.META.get('REMOTE_ADDR')
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23 try:
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24 rate_limiter = RateLimiter(ip, count, interval, lockout)
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bgneal@479
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25 if rate_limiter.is_blocked():
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26 return render(request, 'antispam/blocked.html', status=403)
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27
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28 except RateLimiterUnavailable:
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29 # just call the function and return the result
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30 return fn(request, *args, **kwargs)
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31
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32 response = fn(request, *args, **kwargs)
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33
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34 if request.method == 'POST':
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35
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36 # Figure out if the view succeeded; if it is a non-ajax view,
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37 # then success means a redirect is about to occur. If it is
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38 # an ajax view, we have to decode the json response.
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39 success = False
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40 if not request.is_ajax():
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41 success = (response and response.has_header('location') and
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42 response.status_code == 302)
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43 elif response:
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44 json_resp = simplejson.loads(response.content)
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45 success = json_resp['success']
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46
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47 if not success:
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48 try:
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49 blocked = rate_limiter.incr()
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50 except RateLimiterUnavailable:
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51 blocked = False
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52
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53 if blocked:
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54 return render(request, 'antispam/blocked.html', status=403)
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55
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56 return response
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57
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58 return wrapped
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59 return decorator
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